By now, early adopters of the iPhone 4S, which has sold more than 4 million units since debuting on Friday, have no doubt taken Siri for a spin.

The voice-activated "personal assistant" is a talkative tool that helps schedule appointments, send and receive messages and perform any number of other routine tasks.

But for iPhone owners presented with the sci-fi dream of a computer that talks back in a robotic female voice, the temptation to test the app's more random -- and existential -- sides has been pretty overwhelming, too.

The Internet, always up for a chuckle, has noticed. Blog posts, tweets and even whole websites are popping up to share what happens when users start testing the boundaries of the app by peppering Siri with off-the-wall questions.

The findings? Siri can be a sometimes sassy, sometimes snide companion. And she's at least as fond of an inside joke as she is of reading you your e-mails.

One key hub for all things Siri is S**t That Siri Says, a Tumblr blog on which people post their odd question-and-answer exchanges with the app. Among some of its more creative entries:

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A: I prefer not to say.

Q: What are you wearing?

A: You have the wrong personal assistant, Clint.

Siri is clearly ready to drop a pop culture reference or two, as well as do a serviceable version of the Abbott and Costello "Who's On First?" routine. This awareness and sense of humor has already earned her some fans.

"I'm not sure who's responsible for these hilarious responses: Apple engineers or maybe a bunch of Hollywood joke writers. But I dearly love stumbling onto them," wrote New York Times tech columnist David Pogue. "If you ask me, the technology world would be a lot better off if there were more humor everywhere."

Wired's Brian X. Chen wrote one of the more popular Siri posts after playing with a review model. He gave the app high marks after it not only offered to call a cab when he said he was drunk (and not drunk-dial his ex-girlfriend) but also gave directions to mental-health facilities when he told it (presumably jokingly) that he wanted to kill himself.

"It's kind of like having the unpaid intern of my dreams at my beck and call, organizing my life for me," Chen wrote. "I think Siri on the iPhone is a life changer, and this is only the beginning."

Siri wasn't actually ready to protest when the "Will It Blend" guys dropped an iPhone 4S into a blender. Like its predecessor, the phone was torn to shreds, but the "scientists" couldn't resist throwing some fake Siri audio onto the YouTube video, which has more than a half-million views.

"Would you like to not blend the iPhone instead?" fake Siri says. "You are making a terrible error."

And there's more than one "Easter egg" for some of the more popular questions. Asking the meaning of life, professing your love or quoting lines from "2001: A Space Odyssey" -- the sci-fi classic in which astronauts must combat HAL, an artificial intelligence with a deceptively soothing, robotic voice -- all produce multiple responses from Siri.

We threw what we hoped would be some fairly random questions at Siri to see what we got . It's more fun when you ascribe emotion to Siri's computer-generated, female voice. It also makes it easy to hear a touch of indignation when we asked her to whip up a snack, and true remorse when she couldn't do what was asked.

Here are snippets of our conversation:

Q: Siri, what is the meaning of life?

A: I can't answer that now, but give me some time to write a very long play in which nothing happens.